Final answer:
The act that ceased all full-power analog broadcasting by 2009 and low-power analog broadcasting by 2012 was the Communications Act of 1934. It created the Federal Communications Commission (FCC) to oversee radio and television communication and ensure fair competition.
Step-by-step explanation:
The act that ceased all full-power analog broadcasting by 2009 and low-power analog broadcasting by 2012 was the Communications Act of 1934. This act created the Federal Communications Commission (FCC) to oversee radio and television communication. The FCC has the authority to issue licenses, set standards, assign frequencies, and regulate broadcasting. It also enforced the transition to digital television and the eventual elimination of analog television broadcasting. The act aimed to prevent monopolies, ensure fair competition, and protect the public interest.